On Tuesday, Trump clocked another impressive early state win, this time in the Nevada caucuses, where he ran away with about 46% support. It was his third decisive victory in a row, following first-place finishes in New Hampshire and South Carolina.

Trump has skillfully made himself the leader of an angry swath of the primary electorate enraged at Washington and its own party. Sure, he doesn’t represent every GOP voter, but it doesn’t matter — the rest of the field has been so fractured that Trump’s cadre of impassioned, disillusioned supporters is enough to make him the standard bearer of the Republican Party.

The establishment is now staring that reality in the face, one that was unthinkable just months ago. How — if — they reckon with Trump will be one of the defining political events of this generation.

The incident comes a day before the Nevada Republican caucuses and in the wake of accusations from rival campaigns in recent weeks about Cruz’s campaign tactics. Donald Trump has called Cruz a “liar” and Rubio and Ben Carson have also blasted the Texas senator.

Trump, Rubio and Carson have all attacked Cruz for his ethics ever since Cruz’s victory in Iowa. Cruz later underperformed in South Carolina two contests later.

Cruz says he spent the morning investigating what happened before making his decision. Campaign manager Jeff Roe confirmed that Tyler had formally resigned.

“I have made clear in this campaign we will conduct this campaign with the very highest standards and integrity,” Cruz told reporters Monday, adding that Tyler is a “good man.”

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“This was a grave error of judgment. It turned out the news story he sent around was false but I’ll tell you, even if it was true, we are not a campaign that is going to question the faith of another candidate,” Cruz said.

A former, longtime spokesman for Newt Gingrich, Tyler was a senior aide and one of the Cruz campaign’s first hires in the run-up to his presidential announcement.

Donald Trump found himself in a political dispute Thursday withPope Francis, who said the businessman’s proposal to build a wall along the U.S.-Mexico border is un-Christian.

“A person who thinks only about building walls, wherever they may be, and not building bridges, is not Christian,” Francis told reporters Wednesday. The pope’s comments were first made public on Thursday.

Trump, speaking with supporters at Kiawah Island, S.C., said it is “disgraceful” for the pope to question his religion, and that the pontiff received bad information about him during a recent to Mexico.